The classics that we all remember:
Rubin defeats Novotna from something like 1-6 0-5 0-40. (French Open, 1995)
Mary Jo Fernandez defeats Sabatini from 1-6 0-5. (French Open, 1993 - some say Sabatini's career never recovered after that loss)
Kimiko Date defeats Sabatini from 1-6 0-5 in Miami SF, 1995 (see the above comment)
My scores are only from memory, so they may be wrong give or take a game or two. But those were definitely all classic comebacks/chokes.